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he is talking about the main board ground. . hook it up towards the rear of the radio where the large cap ground lead is soldered to the board. before worring about the hook up point make sure that is the problem

they have 2 different flashing LED's. on a slow flashing one and the other is fast flashing.

on the ones I have used one would make a noise almost constantly and the other only when the color changed.

1st just unsolder one leg of the light and see if that stops your noise problem. if not you will have to move on.